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x in (-oo:+oo)
y = 8*x-(4/5) // - 8*x-(4/5)
y-(8*x)+4/5 = 0
y-8*x+4/5 = 0
y-8*x+4/5 = 0 // - y+4/5
-8*x = -(y+4/5) // : -8
x = (-(y+4/5))/(-8)
x = (y+4/5)/8
x = (y+4/5)/8
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